Moxa velvet is a soft cotton-like product obtained by repeatedly drying， beating and crushing mugwort leaves， screening impurities and dust. Moxa is the raw material for making moxa sticks， and it is also the main material used in moxibustion.

Made from dried leaves of the Asteraceae plant Artemisia argyi. Its color is gray， soft as velvet， flammable， not flame， fragrant， suitable for moxibustion. According to the different degree of processing， there are roughness， roughness is mostly used for warm needles or making moxa sticks， and fineness is mostly used for making moxa cones. The quality of the aged is better.

In Li Shizhen's Compendium of Materia Medica， he said， "If you use mugwort leaves， you must use them for a long time， and make them soft and thin， which is called ripe mugwort; if you use mugwort， moxibustion will easily injure people's muscles and veins." Therefore， when choosing moxa， Chen Airong is more suitable. In the process of moxibustion， moxa velvet with purity below 10:1 is suitable for mild moxibustion， and moxa velvet with purity above 10:1 can be used for direct moxibustion.